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Added rsqrt() method to the Array class: this method computes the coefficient-wise inverse square root much more efficiently than calling sqrt().inverse().

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This commit is contained in:
Benoit Steiner
2015-12-03 18:16:35 -08:00
parent 029052d276
commit e25e3a041b
2 changed files with 22 additions and 0 deletions
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5
test/array.cpp
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@@ -236,6 +236,7 @@ template<typename ArrayType> void array_real(const ArrayType& m)
// avoid NaNs with abs() so verification doesn't fail
m3 = m1.abs();
VERIFY_IS_APPROX(m3.sqrt(), sqrt(abs(m1)));
VERIFY_IS_APPROX(m3.rsqrt(), Scalar(1)/sqrt(abs(m1)));
VERIFY_IS_APPROX(m3.log(), log(m3));
VERIFY_IS_APPROX(m3.log10(), log10(m3));
@@ -292,6 +293,10 @@ template<typename ArrayType> void array_real(const ArrayType& m)
VERIFY_IS_APPROX(m3.pow(RealScalar(0.5)), m3.sqrt());
VERIFY_IS_APPROX(pow(m3,RealScalar(0.5)), m3.sqrt());
VERIFY_IS_APPROX(m3.pow(RealScalar(-0.5)), m3.rsqrt());
VERIFY_IS_APPROX(pow(m3,RealScalar(-0.5)), m3.rsqrt());
VERIFY_IS_APPROX(log10(m3), log(m3)/log(10));
// scalar by array division